package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 用户下单
     * rollbackFor = Exception.class:可以让事物在遇到非运行时异常时也能回滚,不设置就是遇到异常才会回滚
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    @Override
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

        //处理各种业务异常(地址簿为空,购物车数据为空)
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if(addressBook == null){
            //抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        //查询当前用户的购物车数据
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if(shoppingCartList == null || shoppingCartList.size() == 0){
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //向订单表插入1条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setUserId(userId);
        orders.setAddress( addressBook.getDistrictName() + addressBook.getDetail());

        orderMapper.insert(orders);

        /**
         * 这里可以批量插入也可以循环一条条插入,这里使用批量插入(一次只建立一个连接,所以速度快)
         */
        List<OrderDetail> orderDetailList = new ArrayList<>();
        //向订单明细表插入n条数据
        for (ShoppingCart cart : shoppingCartList){
            //订单明细
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart,orderDetail);
            //设置当前订单明细关联的订单id
            orderDetail.setOrderId(orders.getId());
            orderDetailList.add(orderDetail);
        }
        orderDetailMapper.insertBatch(orderDetailList);
        //清空当前用户的购物车数据
        shoppingCartMapper.deleteByUserId(userId);
        //封装VO返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();

        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    @Override
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    @Override
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        //通过WebSocket向客户端浏览器推送消息 type orderId content
        Map map = new HashMap();
        //1表示来单提醒,2表示客户催单
        map.put("type",1);
        map.put("orderId",ordersDB.getId());
        map.put("content","订单号:" + outTradeNo);

        //map转json
        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 历史订单查询
     * @param
     * @return
     */
    @Override
    public PageResult history(int pageNum,int pageSize, Integer status) {

        PageHelper.startPage(pageNum,pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>();

        // 查询出订单明细,并封装入OrderVO进行响应
        if(page != null && page.getTotal() > 0){
            for (Orders orders : page){
                //订单id
                Long orderId = orders.getId();
                //查询订单明细
                List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orderId);
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders,orderVO);
                orderVO.setOrderDetailList(orderDetailList);

                list.add(orderVO);
            }
        }

        return new PageResult(page.getTotal(),list);
    }

    /**
     * 查询订单详情
     * @param orderId
     * @return
     */
    @Override
    public OrderVO showOrders(Long orderId) {
        //查询userName
        Long userId = BaseContext.getCurrentId();
        String userName = addressBookMapper.getByUserId(userId);

        Orders orders = orderMapper.getByOrderId(orderId);
        orders.setConsignee(userName);

        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders,orderVO);

        //查询订单下的所有订单明细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orderId);
        orderVO.setOrderDetailList(orderDetailList);

        return orderVO;
    }

    /**
     * 取消订单
     * @param orderId
     * @return
     */
    @Override
    public void cancelOrder(Long orderId) {

        Orders orders = new Orders();
        orders.setId(orderId);
        orders.setUserId(BaseContext.getCurrentId());
        orders.setCancelTime(LocalDateTime.now());
        //设置状态为取消状态
        orders.setStatus(Orders.CANCELLED);

        orderMapper.update(orders);
    }

    /**
     * 再来一单：就是将原订单的商品重新加入购物车
     * @param orderId
     * @return
     */
    @Override
    public void onceMore(Long orderId) {

        Long userId = BaseContext.getCurrentId();
        //查询出订单id下订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orderId);
        //将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();
            //将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x,shoppingCart,"id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());
        //将购物车对象批量插入添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    /**
     * 管理端取消订单
     * @param ordersCancelDTO
     * @return
     */
    @Override
    public void cancelOrderWithReason(OrdersCancelDTO ordersCancelDTO) {

        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersCancelDTO,orders);
        orders.setUserId(BaseContext.getCurrentId());
        orders.setCancelTime(LocalDateTime.now());

        //设置状态为取消状态
        orders.setStatus(Orders.CANCELLED);
        orderMapper.update(orders);
    }

    /**
     * 订单搜索
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {

        PageHelper.startPage(ordersPageQueryDTO.getPage(),ordersPageQueryDTO.getPageSize());
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        //部分订单状态,需要额外返回订单菜品信息,将Orders转换为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);


        return new PageResult(page.getTotal(),orderVOList);
    }

    private List<OrderVO> getOrderVOList(Page<Orders> page){
        //需要返回订单菜品信息,自定义OrderVO响应结果
        ArrayList<OrderVO> orderVOList = new ArrayList<>();

        //CollectionUtils.isEmpty():可以检查null和长度为0的list
        List<Orders> ordersList = page.getResult();
        if(!CollectionUtils.isEmpty(ordersList)){
            for (Orders orders : ordersList) {
                //将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders,orderVO);
                String orderDishes = getOrderDishesStr(orders);

                //将订单菜品信息封装到orderVO中,并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }

        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     * @param orders
     * @return
     */
    public String getOrderDishesStr(Orders orders){
        //查询订单菜品详细信息(订单中的菜品和数量)
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        //将每一条订单菜品信息拼接为字符串(格式：宫保鸡丁*3)
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        //将该订单对应的所有的菜品信息拼接在一起
        return String.join("",orderDishList);
    }

    /**
     * 用户催单
     * @param id
     * @return
     */
    @Override
    public void reinder(Long id) {
        //根据传来的订单id查询在订单表中是否存在这条数据
        Orders order = orderMapper.getByOrderId(id);

        //校验订单是否存在
        if(order == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        //通过WebSocket向客户端浏览器推送消息 type orderId content
        Map map = new HashMap();
        //1表示来单提醒,2表示客户催单
        map.put("type",2);
        map.put("orderId",order.getId());
        map.put("content","订单号:" + order.getNumber());

        //map转json
        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 各个状态订单数量统计
     * @param
     * @return
     */
    @Override
    public OrderStatisticsVO countStatistics() {
        Long userId = BaseContext.getCurrentId();
        //查询待派送数量
        Integer confirmed = orderMapper.countByStatus(Orders.CONFIRMED, userId);

        //查询派送中数量
        Integer deliveryInProgress = orderMapper.countByStatus(Orders.DELIVERY_IN_PROGRESS, userId);

        //查询待接单数量
        Integer toBeConfirmed = orderMapper.countByStatus(Orders.TO_BE_CONFIRMED, userId);

        return OrderStatisticsVO
                .builder()
                .confirmed(confirmed)
                .deliveryInProgress(deliveryInProgress)
                .toBeConfirmed(toBeConfirmed)
                .build();
    }

    /**
     * 订单接单
     * @param ordersConfirmDTO
     * @return
     */
    @Override
    public void updateConfirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = new Orders();
        orders.setId(ordersConfirmDTO.getId());
        orders.setStatus(Orders.CONFIRMED);
        orderMapper.update(orders);
    }

    /**
     * 订单拒单
     * @param ordersRejectionDTO
     * @return
     */
    @Override
    public void updateRejection(OrdersRejectionDTO ordersRejectionDTO) {
        Orders orders = Orders
                .builder()
                .id(ordersRejectionDTO.getId())
                .rejectionReason(ordersRejectionDTO.getRejectionReason())
                .status(Orders.CANCELLED)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 派送订单
     * @param id
     * @return
     */
    @Override
    public void updateDelivery(Long id) {
        Orders orders = Orders
                .builder()
                .id(id)
                .status(Orders.DELIVERY_IN_PROGRESS)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 完成订单
     * @param id
     * @return
     */
    @Override
    public void updateComplete(Long id) {
        Orders orders = Orders
                .builder()
                .id(id)
                .status(Orders.COMPLETED)
                .build();
        orderMapper.update(orders);
    }
}
